code: def dtypes(self):
      return [
          ("date", "datetime64[ns]"),
          ("open", "float64"),
          ("high", "float64"),
          ("low", "float64"),
          ("close", "float64"),
          ("volume", "float64"),
      ]
  
file_path: catalyst/catalyst/data/bundles/base_pricing.py
imports: from catalyst.data.bundles.base import BaseBundle
  from catalyst.utils.memoize import lazyval
label_desc: Use image node_id 2 for calling the BasePricingBundle obj's underlying member method code with example usage: obj.dtypes() and returns: list